Re: [sumo-user] RouteSampler.py demand generation problems

[Jakob Erdmann <namdre.sumo@xxxxxxxxx>]

routeSampler only uses the routes that you already provide as input. Of course, you can use implausibleRoutes.py before running routeSampler to analyze and tailor the input.

Looking at your scenario, I see the following issues

- uncoordinated/unjoined traffic light in the city center

- missing acceleration lanes at your motorway on-ramps. This turns highway on-ramps into normal junctions and reduces flow significantly.  (add ramps manually or rebuild your network with option --ramps.guess. This may split some edge which invalidates routes so afterwards you will have to regenerated your route files or repair them with duarouter option --repair

regards,

Jakob

Am Mi., 8. Juli 2020 um 08:08 Uhr schrieb Anil Baral <baral.anil99@xxxxxxxxx>:

Thanks Barry. I tried to remove some routes that created traffic jams in the network due to U-turn, but it only reduces some traffic jams. It doesn't solve the jam in other parts of the network. I would like to know if there is any other way to generate and check the implausible routes. Is there a way to use implausibleRoute.py with routeSampler to improve the traffic flow? 

Thanks, 

Anil 

On Mon, Jul 6, 2020 at 4:35 AM Evans, Barry <B.Evans@xxxxxxxxxxxx> wrote:

Hi Anil,

I haven't looked over the data but I had a similar problem when I was using routeSampler.py. One of causes I found for sever jams was to do with some vehicle routes either starting with or ending with a U-turn manoeuvre.

What I did was run the model in the GUI and visually look for where these jams are occurring and then click on the car that I believe to be causing the jam to see if it is attempting a U-turn either at the start of its journey or the end. If it is I'd then go into the rou.xml file in a text editor like notepad++ and look at the id of the vehicle causing the jam and trim either the beginning or the end of its route accordingly to remove the U-turn manoeuvre.

If this is the issue, removing these U-turns will help reduce jams.  I hope this helps but if not maybe someone else who is more familiar with routeSampler.py could help.

All the best,

Barry


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Subject: [sumo-user] RouteSampler.py demand generation problems

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Hi all,
I have use routeSampler.py to generate demand with edge count data. The edge data was generated from the flow file and contains the hourly count on the edges with detectors.  I was successfully able to generate the vehicle using routeSampler, and the mismatch was almost negligible. However, when I run the simulation, I find a lot of jam during *peak hours*.  I have used the actuated traffic light and most probably traffic light is not the cause of traffic jams.  I am not sure how to deal with this problem. I think it is due to the routes that are being generated by routeSampler.py.  Please suggest how can I deal with these issues and what can be the probable causes?

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Thanks
Anil




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